Device for temporarily converting a continuous ray pencil into an intermittent one



P. BECKER. DEVICE FOR TEMPORARILY CONVERTING A CONTINUOUS RAY PENCIL INTO AN INTERIVIITTENT 0 NEI APPLICATION FILED AUG.3, I921.

PflIJGLLIJGd Aug. 1, 1922.

7 :PAUL BEGKER, Z JIENA, GERMANY, ASSIGNOR TO THE FIR-M Of? CARL ZEISS, 0F JENA,

GERMANY.

DEVICE FOR TEIVIPOBJARILY CONVERTING A CONTINUOUS RAY BENCIL INTO AN INTERMITTEN T ON E.

incense.

Application filed August 8,

and containing a circular disc of a substance impervious to light, rotatable about its axis and provided with a number of sections, consecutive in the direction of its circum- 'li'erence.

The subject of the invention is chiefly to be used for giving signals with that kind of phototelegrapl'iy with which there serves as a receiver, a telephone connected to a cell sensitive to light, e. a selenium cell, and with which to an observer, looking at the transmitter oil? the signals, the pencil of rays is always to appear with the same bright ness during the transmission of the signals and the intervals between the same. The invention aims atconstructing the device in such, a manner as to be suitedior a corresponding conversion of pencils of rays of a comparatively large cross section as directly produced,-e. g. by larger searchlights.

According to the invention this object is attained by disposing parallel to the rotatable disc a number olt' arms, connected to the pedestal body of the said disc in such a manner, that they may (be brought into two different terminal positions, in one of which, when the disc is rotated, they always cover a part as invariable as possible of its segments, Whilst in the other position, when the disc is rotated they alternately cover the said segments completely and leave them quite free. Relative to the ray pencil the said de vice is suitably disposed in sucha way that the axis of rotation ofthe disc coincides with that oi the said pencil of rays, so that the diameter of the disc need only be equal to that of the pencil of rays. In the new device the conversion of the pencil of rays into an intermittent one is efl ected by turning the arms (which should suitably be all coupled to each other) from the first mentioned ter- Specification of Letters Patent.

PatentedAngLIQZZ. 1921. Serial No. 490,722/

initial position into that mentioned in the second place. By constructing the arms as thin strips, each of them may, e. g. be rotatably disposed about an axis, running parallel to a radius of the disc. In such case, as the first of the two terminal positions of the arms, in which, when rotating the disc, they cover an always invariable,'viz inthis case an infinitesimal portion of the segments of the said disc (viewed in the direction of the rays of light which are all supposed to run parallel to each other), that position should be considered, in which the planes of the strips are vertically directed to the disc and as the second terminal position that, in which the planes of the strips run parallel to the disc. If the said device is also to fulfil the other above mentioned condition, viz. that to an observer looking at the transmitter of the signals the pencil of rays appears with the same brightness both during the transmission of the signals and the intervals between the single signals, viz. in the two terminal positions of the arms, the latter must be also provided with a device, by

m eans of which in the first terminal position a certain part of the light is stopped down,

because with the periodical interruption or the pencil of light (in the second terminal position of the arms) always a certain, not to be neglected part of the rays penetrating the segments of the disc goes lost.

The necessity of adding to the arms a special stopping device in order to attain a uniform brightness at any time may, however, be suitably avoided by composing each or the arms 01 two members, each of which being rotatably disposed about one of two pivots, standing both vertically to the plane of the disc, and further by uniting the two members by a joint in such'a way that, 011 the one hand, they may be brought into a position in which they form together a bent arm and, on the other hand, into a position in which they form together a stretched arm. By then disposing, for instance, the journals for the members of the arm in such a way that they lie ona straight line running radially to the axis of rotation of the disc and by further constructing the segments of the disc as radial slits, the same are temporarily quite covered on the disc being rotated, pro vided the arms are of corresponding size and stretched. By bending, however, the

The annexed drawing shows as a constructional example a device of the last mentioned held in position by these being shown in the drawing) which I connect it as a casing f.

7 7t? fixed to the casing on the one hand, by

a other hand, a key k kind in two sections, viz Fig. l a section perpendicular to the axis of the device, Fig. 2 a section parallel to the axis of the device.

This device contains a disc composed of two circular-rings a and a and of a number of sector-shaped tins a uniting the two ings with each other.' The ring a forms part of a nave by which the disc is fixed to a shaft 6, carrying also a grooved-roller If. All tins a are of the same Width and are disposed at such a distance apart that the width of the. slits remaining'between them amounts to one third of that of the tins. The shaft b is supported by a pedestal body 0, disposed inside a hollow cylinder at and screwed to the same. The said cylinder is four tins 6 (only two of well as the pedestal body cvto Moreover, between the tins e and; the rotatable disc at number of arms are disposed, each of these consisting of a member g and a member 9 The members marked 9 are rotatable each about a pivot 7' and those marked g about a pivot 72?, fitted to the pedestal body 0.

Besides, each member is provided with a slit and in the slits of two members each, forming an arm, there engages a pin 2'. All pins 2 are fastened to a ring it, connected by the arms is to a nave 70 which is rotatably disposed on the pedestalbody c.

lfinally, there is connected to the ring 71'', means of a' band 7c" a the casing f and, on the 7 By means ofthe said spring 7c? the/arms g 9 strive to-always assume a bent shape and they can'continue this endeavour as far a terminal position which is determined by the touch of the said hey it" at the upper end of a slit f in the casing f". In this position, when rotating the disc'a, a a the armscover a part always approximately equal of the slits-in the said spring 7s fixed to disc, so that a pencil of light penetrating the slits does not suffer an important interrupcircumference,

stance impervious to the the key is? opposed to the action of the spring 70 as far as its lower stop, the arms are brought into a second terminal position. in the latter,ishown in the drawing for one of the arms by a dotted line, the members g and g form a stretched arm which, when the disc a, m, a is rotated, temporarily quite covers and temporarilylleaves"entirely free the slits in this disc.

In order to be used, the said device should be fixed to the casing of a search-light before its front glass in such a manner that the rotatable disc is facing the source of light. By then rotating the disc a a a from a motor by means of a cord running over the roller 6 it will only be necessary for giving an intermittent, luminous signal to push down the'key in action of the spring 70 I claim: I 1, In a device for temporarily converting a continuous pencil of rays of light into an intermittent one, a circular disc of a sub stance impervious to light rotatable about its axis and provided witha number of segments, consecutive in the direction of its a number of arms disposed parallel to the said rotatable disc and rota- 'tably so connected to the pedestal body of thesaid disc that they maybe brought into two difierent terminalpositions, in one of which, on the disc being' rotated, they cover a part as invariable as possible of the said segments, whilst in the other one, on the disc being rotated, they alternately cover the segments completely and leave them quite tree.

2. in a device for temporarily converting a continuous pencil of rays of light into an opposed to the intermittent one, a circular disc of a .snb-

light rotatable about with a number of-seg'- ments, consecutive in the direction of its. circumference, a number of arms disposed parallel to the said rotatable disc, each of said arms consisting of two members each about one of two pivots, perpendicular to the plane of the said disc, means for so connecting the said two members to each other that, on the one its axis and provided rotatably disposed hand, they form together a bent arm and,

on the other hand,'they' form together a stretched arm. r

7 PAUL BECKER. Witnesses: I

PAUL'IiRfiGER, RICHARD HAHN. 

